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--- apps:docker:troubleshooting [2025-02-01 20:10] – add info to disk usage Manuel Frei
+++ apps:docker:troubleshooting [2025-02-04 17:09] (current) – add xargs data Manuel Frei
@@ Line 54: / Line 54: @@
 container_pid="$(docker inspect --format "{{ .State.Pid }}" "${container_id}")"
 nsenter -n -t "${container_pid}" tcpdump -nn -i eth0
+</code>
+===== Logs =====
+==== Add Local Timestamp to Container Logs ====
+If a container is logging without a timestamp or with an unknown time zone, you can add a timestamp while watching the logs.
+<code bash>
+docker logs mycontainer -n 0 -f | xargs -IL date +'[%Y-%m-%dT%H:%M:%S%:z] L'
+</code>
+In case you want to catch the stderr logs, too
+<code bash>
+docker logs mycontainer -n 0 -f 2>&1 | xargs -IL date +'[%Y-%m-%dT%H:%M:%S%:z] L'
+</code>
+<code - Example>
+root@server:~# docker logs mycontainer -n 0 -f 2>&1 | xargs -IL date +'[%Y-%m-%dT%H:%M:%S%:z] L'
+[2025-02-04T16:55:01+01:00] 2025-02-04T15:55:01+0000 INFO main.py:24 send request for url http://server/ping.
+[2025-02-04T16:55:01+01:00] 2025-02-04T15:55:01+0000 INFO main.py:29 Received answer with HTTP status code 200 and content: GET: pong
+[2025-02-04T16:55:03+01:00] 2025-02-04T15:55:03+0000 INFO main.py:24 send request for url http://server/ping.
+[2025-02-04T16:55:03+01:00] 2025-02-04T15:55:03+0000 INFO main.py:29 Received answer with HTTP status code 200 and content: GET: pong
+[2025-02-04T16:55:05+01:00] 2025-02-04T15:55:05+0000 INFO main.py:24 send request for url http://server/ping.
+[2025-02-04T16:55:05+01:00] 2025-02-04T15:55:05+0000 INFO main.py:29 Received answer with HTTP status code 200 and content: GET: pong
 </code>